Koehler is a hard thrower from New York who pitched at Stony Brook University. Since being called up from Triple-A New Orleans, he's been effective for Miami, posting 7 1/3 scoreless innings with eight strikeouts.

"For me, I'm just going to try to go out there and throw until they tell me not to," Koehler said. "That's all I can do in the situation that I'm in, and hope for the best."

The right-hander made his big league debut last September, pitching in eight games with one start. He struck out 13 batters in 13 1/3 innings.

"I don't know if I'm missing more bats," Koehler said. "I'd say I'm probably executing a little better, and really sticking to the plan that's in place, and just going from there."